A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brian Walton
Date: 2019 Jan 14, 18:43 -0800
Encouraged by the excellent analysis by members of Capt Worsley’s log, I used my limited resources to go back further to search for his layout, and found this by Coleman, published in 1846. Raper and Bowditch have almost identical methods. Table XXI shows how to get from (Hav) log to time.
All three authors also show how to calculate azimuth from the same data in a very similar fashion.
70 years later, Capt Worsley does not use methods devised by Sumner or St. Hilaire.